Traits taxon details
original description
Boettger, O. (1889). Die Entwicklung der Pupa-Arten des Mittelrheingebietes in Zeit und Raum. <em>Jahrbücher des Nassauischen Vereins für Naturkunde.</em> 42: 225-327., available online at https://www.biodiversitylibrary.org/page/7155832 page(s): 268-269 [details]
additional source
Bruggen, A. C. van. (1994). Revisionary notes on <i>Negulus</i> O. Boettger, 1889, a genus of minute African land snails (Gastropoda Pulmonata: Vertiginidae). <em>Zoologische Mededelingen.</em> 68 (2): 5-20. Leiden., available online at https://repository.naturalis.nl/pub/318176 page(s): 6 [details]
additional source
Schileyko, A. A. (1998). Treatise on Recent terrestrial pulmonate molluscs. Part 2. Gastrocoptidae, Hypselostomatidae, Vertiginidae, Truncatellinidae, Pachnodidae, Enidae, Sagdidae. <em>Ruthenica.</em> Supplement 2: 129-261. Moskva [November]. page(s): 163 [details] 
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